Doubledown and hair pulling fuel pressure puzzles

[fz1mini]

some late model cars use fuel systems that dont have return lines.there is a pressure sensor at the end of the fuel rail.the ecm pulses the voltage to the fuel pump.as the goverment clamps down on emissions standards there will be more sensors and electronics to deal with.

[amergin]

Originally Posted by Gene\";p=\&quot

Rusty,
Scott Horner suggests: *If you are going with the braided stainless the best pump is the Accel part number 74701 *and use the Aeromotive regulator pn 13301. The regulator is installed after the fuel rail and has a screw to regulate pressure. It comes with low and high pressure springs and you must change to the high pressure spring since it is in the box. I have this setup on my car and it works perfectly.

Why haven't we seen pics of your car? Kudos to Doubledown!

All this work has been on the Seuferer (Kevin's) car so you have seen pics.

OK need some clarity here. You keep saying after the fuel rail. Unlike the Busa the 1000 only has a single input on the fuel rail. So how do I place the regulator after the fuel rail? The fuel setup now looks like the below.

 * * * * * * * * * * * * * * * * * * * * * * * * * * * *|--->Flow Meter
 * * * * * * * * * * * * * * * * * * * * * * * * * * * *|
Tank Fuel Pickup--->Fuel Pump--->Regulator--->Fuel Rail
 * * * * * * * * * * * * * * * * * * * * * * * * * * * *|
 * * * * * * * * * * * * * * * * * * * * * * * * * * * *|--->Bypass to Tank

The only problem is when the pump is primed it starts to make a high pitched noise. When the pump is connected directly to the fuel rail it does not make this noise ever. Then again the engine runs like crap that way too. So I'm assuming the pump is over working which is why it is making this outrageous noise. Not sure how I could run it after the fuel rail unless we pick up an after market rail with connectors on both ends. If I use a T adaptor before the rail where does the feed line then go? Two return lines into the tank?

Here's the Hyper setup

http://www.hyperracing.com/docs/standar ... ection.pdf

Looks like they just use the single bypass to the tank and plug the other output port. Unless I'm looking at the drawing wrong.

Confused yet? I am [smilie=banghead.gif]

[doubledown]

rusty, remember when we tried to use your regulator on the return side? by doing that you keep all the volume at the injectors and bleed off the return line to the tank. This way the pump never gets bogged down with a heavy load from not being able to run at the rpm it wants to operate. *I use the "hyper "system on my race car and it works very good. Mike Dicely machines his own fuel rail that has 2 ports, one for entry and an exit which is were the fuel bypass regulator goes. *Again, the bypass regulator has to work off the return line not the main pressure line. if the regulator was on the pressure side, then volume is comprimised to get the pressure to 43 lbs.

[amergin]

Yeah Rich I've been looking into this issue further since I posted last. You're right on the mark. Good thing I started looking into this issue, Kevin is a little over anxious to get out and run this thing. With the pump setup this way it wouldn't be long before it burnt out.

Spoke with the guys at RCC Turbo concerning this issue. According to them there are three ways to solve the problem.

• 1. Ghetto way is to use a single T before the fuel rail inlet.
  2. Inexpensive but proper way is to use a fuel rail insert.
  3. The expensive but best solution is to buy a new fuel rail.

RCC has fuel rail inserts for $25. Nifty little units that is easy to install.
http://www.rccturbos.com/rcc2005/index. ... tail&id=59

Since there is no Turbo on this engine RCC suggested we just use a t-adaptor. Although they would be more then willing to sell us a fuel rail for $275.

I'll let Kevin decide which way he wants to go. Anyone want to take bets on which option he goes with?